Download pSENSE
Transcript
OPERATION MANUAL PORTABLE CO 2 METER Model: pSENSE pSENSE RH INTRODUCTION Thank you for purchasing this portable CO 2 me ter. The me ter me asures CO 2 level, air temp ., dew point, wet bulb temp . and humi dity(DP, WB , RH are for mo del pSENSE RH) and is an ideal instrume nt for indoor air quality (IAQ) diagnosis. Poor indoor air quality is considered unhealthy because it causes tiredness, loss of ability to concentrate, and even illness(ex. Sick Building Syndrome ). IAQ mo nitoring and survey, especially on CO 2 level and air ventilation become widely applied in public areas such as offices, classrooms , factories, hospitals and hotels. It is also suggested in regulations of industrial hygiene in some countries. (Appendix) The portable CO 2 me ter uses NDIR (nondispersive infrared) technology to ensure the reliability and long term stability. It’s useful in verifying HVAC system performance and air ventilation control. Features: Triple displays of CO 2 level, temp. and humidity (pSENSE RH). Stable NDIR sensor for CO 2 detection Statistics of weighted average s TWA (8 hours weighted average) STEL(15 minutes weighted average) Backlight for working in dark area Audile CO 2 warning alarm Battery and adaptor power supply E asy manual calibration on CO 2 and humidity (RH for pSENSE RH only) PC connect via RS232 interface 1 MATERIAL SUPPLIED This package contains: Meter 4pcs AA batteries Operation manual Hard carrying case Optional accessory: Calibration kit 33% and 75% (00-0-0017) Adaptor (9V/100~240Vac) RS232 cable and software (00-0-0018) POWER SUPPLY The meter is powered by either 4 AA batteries or a DC adaptor(9V/1A output). Install the batteries into the battery compartment on the rear and make sure they are in correct polarity and good contact. When an adaptor is used, it will cut off the power supply from batteries. The adaptor can’t be used as a battery charger. When battery voltage gets low, a nd “Lob” will appear on the LCD (Fig.1) . And beeper sounds. The CO 2 sensor can’t work under low voltage, so it beeps to indicate failed CO 2 measurement (press any key but SET to stop the beeps) and the readings won’t be displayed. Please replace with fresh b atter ies or connect with an adaptor. CO 2 O CO 2 Fig.1 pSENSE O pSENSE RH 2 % LCD DISPLAY HOLD TWA STEL CO 2 CO 2 concentration in ppm ftm Air temp. Dew point Wet bulb temp. in o C or oF m/s % O Relative humidity in % Symbols Time weighted average( 8 hours) S hort-term exposure limit (15 minutes weighted average) HOLD Readings are freezed unchanged MIN/MAX Minimum/Maximun readings Low battery indicator DP Dew point temperature(pSENSE RH) AIR Air temperature WBT Wet bulb temperature(pSENSE RH) % Unit of relative humidity o E (C/F) Celsius/Fahrenheit TWA STEL KEYPAD SET CAL Esc Turns on and off the meter. Enters setup mode. Sets as non-sleep mode with . Exits setup page/mode. Enters CO 2 calibration with . Enters RH calibration with DP/WBT . Freezes the current readings. Cancels data hold function. Activates or cancels the backlight. Selects unit or increases value in setup. DP/WBT N M X /AV Selects AIR, DP, WBT temps display. (PSENSE RH only) Selects unit or decreases value in setup. Activates MIN,MAX,STEL,TWA function. Saves and finishes settings. 3 OPERATION POWER ON/OFF Press SET to turn the meter on and off. At power up, it emits a short beep and performs 30 seconds countdown(Fig.2) for meter warm up, then enters normal mode with current CO 2, temperatures, and humidity(pSENSE RH) readings displayed (Fig.3). Fig. 2 CO 2 CO 2 O Fig 3 % O Model pSENSE RH Model pSENSE TAKING MEASUREMENT The meter starts measurement when power on and update readings every second. In the condition of operating environment change (ex. from high to low temp.), it takes 30 sec to respond for CO 2 sensor and 30 minutes for RH. NOTE: Do not hold the meter close to faces in case exhalation affects CO 2 levels. AIR(all models),DP,WBT (pSENSE RH) Press DP/WBT to switch temperatures display. The lower left display will cycle from air temperature, dew point temp. (Fig.4), and wet bulb temp.(Fig.5). CO 2 O CO 2 % O Fig.5 Fig.4 4 % DATA HOLD Press to freeze the readings, "HOLD” icon is displayed on the left top of LCD(Fig.6). All current readings are kept unchanged, except STEL and TWA. Press again to cancel the hold function. CO 2 HOLD % O Fig.6 BACKLIGHT Hold down for more than 1 second to activate and cancel backlight function. MIN,MAX,STEL,TWA Under normal mode, press M /AV to see the minimum, maximum, and weighted average readings. Each press of M /AV , it displays MIN, MAX, STEL, TWA in sequence and returns to normal mode. N X N X In MIN and MAX modes, it shows the minimum and maximum readings of CO 2 on main display and of AIR or Dp or WB temperatures and humidity (pSENSE RH) on the lower displays. (Fig.7) CO 2 % O Fig.7 In STEL and TWA modes, the main display shows the weighted average of CO 2 readings for the past 15 minutes (STEL) and 8 hours(TWA). The lower displays are the current AIR, DP/WB temperatures and humidity (pSENSE RH). (Fig.8) 5 STEL CO 2 O % Fig.8 NOTE: 1. If the meter is turned on for shorter than 15 minutes, the STEL value will be the weighted average of readings taken since power on. Same for TWA values appear before 8 hours. 2.It takes at least 5 minutes to calculate STEL and TWA. The display shows “----” (Fig.9) during the first 5 minutes from power on. STEL CO 2 O % Fig. 9 3. While all readings are held unchanged, STEL and TWA will keep updating every 5 minutes. ALARM The meter features audible alarm to give warnings when CO 2 concentration exceeds the limit. (See P1. 0 in setup for setting alarm threshold). It emits beeps(Abt.80dB)when CO 2 level goes over the set value and stops when any key (but SET ) was pressed or readings fall below the set value. It beeps again when value goes over the limit. Restart the meter if beeper can't be stopped. AUTO POWER OFF The meter turns off automatically after 20 minutes of inactivity. To override the function, hold down SET and for 2 seconds to turn on the meter until “n” appears. NOTE: Auto sleep function will be disabled during calibration mode. 6 SETUP Hold down SET un der normal mode for more than 1 sec to enter setup mode. To exit setup, press CALEsc in P1. 0 or P3. 0 and it returns to normal mode. Note: P2. 0 is not applicable in these models but for future model with CO and CO 2 measurement. P1.0 CO 2 ALARM When entering setup mode, P1. 0 and “AL” (Fig.10) are displayed on the LCD. Press M /AV to go into P1. 1 for setting CO 2 alarm threshold. The current set value will be blinking on LCD (Fig11). N X CO 2 CO 2 Fig. 10 Fig. 11 Press to increase the value or DP/WBT to decrease. Each press tunes 100 ppm and the alarm range is from 100 to 9900ppm. When the preferred alarm value is set, press M /AV to save the setting or CALEsc without saving and return to P1. 0 . N X P3.0 TEMPERATURE SCALE Press or DP/WBT in P1. 0 to access P3. 0 for setting up temperature scale(Fig.12). Press M /AV and it goes into P3. 1 with blinking oC or oF current set(Fig.13) on o o the lower left display. To switch C or F, press and DP/WBT . Then press M /AV to save the setting or CALEsc without saving and return to P3. 0 . N X N X O Fig. 12 Fig. 13 7 CO2 CALIBRATION The meter defaults to be calibrated manually in the ambient air where CO 2 concentration is around 400ppm. CAUTION: Do not calibrate the meter in the air with unknown CO 2 concentration. Otherwise,it will be calibrated as 400ppm by default and leads to inaccurate measurements. Calibration site It is suggested to calibrate the CO 2 sensor in fresh outdoor air that is well ventilated and better in sunny weather. Do not calibrate the meter in places crowded with people or close to where with high CO 2 concentration such as ventilating outlets or fireplaces. Procedure Place the meter in the calibration site. Turn on the meter and hold down CALEsc and simultaneously to enter CO 2 calibration mode (Fig.14). 400ppm and “CAL” are blinking on the LCD while performing calibration. CO 2 Fig. 14 Wait about 10 minutes until the blinking stops and the calibration is completed automatically and back to normal mode. To abort the calibration, turn off the meter at any time. NOTE: Ensure the batteries are with full voltage during the calibration to prevent from interruption or failed calibration. 8 RH CALIBRATION (pSENSE RH) The meter defaults to be calibrated the humidity with 33% and 75% salt solution. The ambient condition is recommended to be at 25 o C and stable humidity(better to be close to the calibrating value). To abort calibration, just turn off the meter. CAUTION: Do not calibrate the humidity without the default calibration salt. Otherwise, it will cause permanent damage. Contact the dealer for calibration salt or services. 33% calibration Plug the sensor probe into 33% salt bottle. Hold down CALEsc and DP/WBT under normal mode to enter 33% calibration (Fig.15). “CAL” and calibrating value (32.7% if at 25 oC) are blinking on the LCD with current temperature at the left. Meter is now calibrating, and will finish in about 60 minutes when “CAL” and humidity stop blinking. (Fig.16) O % O Fig. 15 % Fig. 16 75% calibration After 33% calibration, plug the sensor probe into 75% salt bottle, then press M /AV to enter 75% calibration (Fig.17). N X O 9 % Fig.17 “CAL” and calibrating value (75.2% if at 25 oC) are blinking on the LCD with current temperature at the left. Meter is now calibrating. Wait about 60 minutes until blinking stops, then calibration is completed and it returns to normal mode. NOTE: Users can also calibrate either point. To calibrate 33% only, press CALEsc and exit when 33% calibration is completed. To calibrate 75% only, press or DP/WBT within the 5 minutes while initializing 33% calibration. TROUBLESHOOTING Can’t power on Press SET for more than 0.3 seconds and try again. Check whether batteries are in good contact and correct polarity, or the adaptor is well plugged. Fixed readings Check whether data hold function was activated. (HOLD icon at the left top) Slow response Check whether the air flow channels on the rear were blocked. Error messages E01: CO2 sensor damaged. E02: The value is under range. E03: The value is over range. E04: The original data error results in this error (DP, WB) E07: Too low voltage to measure CO2. Replace batteries or use an adaptor. E11: Retry humidity calibration. E17: Retry CO2 calibration. E31: Temperature sensor damaged. E34: Humidity sensor damaged. 10 PC CONNECTION The meter can do PC link for on-line logging and data analysis via RS232 interface and software. The protocol is as follows. A.9600 bps, 8 data bits, no parity. B.Format ( ASCII) Model pSENSE Cxxxxppm:Txxx.xC(F) LRC CRLF Description: $CO 2 :Air LRC CRLF Model pSENSE RH Cxxxxppm:Txxx.xC(F):Hxx.x%: dxxx.xC(F):wxxx.xC(F) LRC CRLF Description: $CO 2 :Air:RH:DP:WBT LRC CRLF SPECIFICATION 7752pSENSE 7755 pSENSE77535 RH 77532 CO2 0~2000ppm 0~5000ppm 2001~9999(out of scale) 5001~9999(out of scale) 1 ppm 1 ppm Resolution Range ±50ppm±5%rdg(0~2000) ±30ppm±5%rdg(0~5000) Accuracy Not specified for out of scale Not specified for out of scale Pressure Dependence Temp. Range Resolution Accuracy Humidity Range Resolution Accuracy Warm up Operating Storage Power Battery life +1.6% reading per kPa deviation from normal pressure, 100kPa -10.0~60.0℃ (14~140℉) 0.1℃/0.1℉ ±0.6℃/ ±0.9℉ 0.0~99.9% 0.1% 0.0~99.9% 0.1% ±3%(10~90%) ±3%(10~90%) N/A ±5%(others) ±5%(others) 30 seconds 0~50℃, 0~95%RH (avoid condensation) -20~60℃, 0~99%RH (avoid condensation) 4pcs AA batteries, DC adaptor 24 hours (Alkaline) 11 CO2 LEVELS AND GUIDELINES The following are excerpts from ANSI/ASHRAE addendum standard 62.1-2004: Enforceable and/or regulatory levels: OSHA -5000ppm The Occupational Safety and Health Administration MAK -5000ppm or 10000ppm(1h) German institution Non-Enforced Guidelines and Reference levels: Canadian - 3500ppm (Long-term) NIOSH-5000ppm or 30000ppm(15 min) The U.S.National Institutes of Health ACGIH-5000ppm or 30000ppm(15min) The American Conference of Governmental Industrial Hygienists (ACGIH) NOTES : TWA(Time Weighted Average) value stands for the average carbon dioxide level exposure during 8 hours(working day) is 5000ppm/5 days. STEL(Short-Term Exposure Limit) value shows the last 15 minutes CO 2 concentration is 30,000ppm. ASHARE Standard 62–1989,Sec.6.1.3 :Comfort (odor) criteria are likely to be satisfied if the ventilation rate is set so that 1,000 ppm of CO 2 is not exceeded. 12 WARRANTY The meter is warranted to be free from defects in material and workmanship for a period of two years from the date of purchase. This warranty covers normal operation and does not cover misuse, abuse, alteration, neglect, improper maintenance, or damage resulting from leaking batteries. Proof of purchase is required for warranty repairs. Warranty is void if the meter has been opened. RETURN AUTHORIZATION Authorization must be obtained from the supplier before returning items for any reason. When requiring a RA (Return Authorization), please include data regarding the defective reason, the meters are to be returned along with good packing to prevent any damage in delivery and insured against possible damage or loss. SENSEAIR AB Box 64 Stationsgatan 12 82060 Delsbo Sweden Contact Telephone +46(0)653-717770 Fax +46(0)653-717789 [email protected] www.senseair.se 13